vss.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file vss.c the virtual streaming system
   8  *
   9  * This contains the audio streaming code of para_server which is independent
  10  * of the current audio format, audio file selector and of the activated
  11  * senders.
  12  */
  13
  14 #include "para.h"
  15 #include "afh.h"
  16 #include "server.h"
  17 #include <sys/mman.h> /* mmap */
  18 #include <sys/time.h> /* gettimeofday */
  19 #include "server.cmdline.h"
  20 #include "afs_common.h"
  21 #include "vss.h"
  22 #include "send.h"
  23 #include "error.h"
  24 #include "string.h"
  25 #include "fd.h"
  26
  27 extern const char *status_item_list[];
  28
  29 static struct timeval announce_tv;
  30 static struct timeval data_send_barrier;
  31 static struct timeval eof_barrier;
  32 static struct timeval autoplay_barrier;
  33
  34 extern struct misc_meta_data *mmd;
  35 extern struct audio_file_selector selectors[];
  36 extern struct sender senders[];
  37
  38 static int audio_file;
  39 static char *map;
  40
  41 /* The mp3 audio format handler does not need any libs. */
  42 void mp3_init(struct audio_format_handler *);
  43
  44 #ifdef HAVE_OGGVORBIS
  45         void ogg_init(struct audio_format_handler *);
  46 #endif
  47 #ifdef HAVE_FAAD
  48         void aac_afh_init(struct audio_format_handler *);
  49 #endif
  50
  51 /**
  52  * The list of supported  audio formats.
  53  *
  54  * We always define the full array of audio formats even if some audio formats
  55  * were not compiled in. This is because for each audio file the number of its
  56  * audio format is stored in the databse. We don't want that numbers to become
  57  * stale just because the user installed a new version of paraslash that
  58  * supports a different set of audio formats.
  59  *
  60  * It can still be easily detected whether an audio format is compiled in by
  61  * checking if the init function pointer is not \p NULL.
  62  */
  63 static struct audio_format_handler afl[] = {
  64         {
  65                 .name = "mp3",
  66                 .init = mp3_init,
  67         },
  68         {
  69                 .name = "ogg",
  70 #ifdef HAVE_OGGVORBIS
  71                 .init = ogg_init,
  72 #endif
  73         },
  74         {
  75                 .name = "aac",
  76 #ifdef HAVE_FAAD
  77                 .init = aac_afh_init,
  78 #endif
  79         },
  80         {
  81                 .name = NULL,
  82         }
  83 };
  84
  85 static inline int next_audio_format(int format)
  86 {
  87         for (;;) {
  88                 if (!afl[format].name)
  89                         return format;
  90                 format++;
  91                 if (afl[format].init)
  92                         return format;
  93         }
  94
  95 }
  96
  97 /** Iterate over each supported audio format. */
  98 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
  99
 100
 101 /**
 102  * check if vss status flag \a P (playing) is set
 103  *
 104  * \return greater than zero if playing, zero otherwise.
 105  *
 106  */
 107 unsigned int vss_playing(void)
 108 {
 109         return mmd->new_vss_status_flags & VSS_PLAYING;
 110 }
 111
 112 /**
 113  * check if \a N (next) status flag is set
 114  *
 115  * \return greater than zero if set, zero if not.
 116  *
 117  */
 118 unsigned int vss_next(void)
 119 {
 120         return mmd->new_vss_status_flags & VSS_NEXT;
 121 }
 122
 123 /**
 124  * check if a reposition request is pending
 125  *
 126  * \return greater than zero if true, zero otherwise.
 127  *
 128  */
 129 unsigned int vss_repos(void)
 130 {
 131         return mmd->new_vss_status_flags & VSS_REPOS;
 132 }
 133
 134 /**
 135  * check if the vss is currently paused
 136  *
 137  * \return greater than zero if paused, zero otherwise.
 138  *
 139  */
 140 unsigned int vss_paused(void)
 141 {
 142         return !(mmd->new_vss_status_flags & VSS_NEXT)
 143                 && !(mmd->new_vss_status_flags & VSS_PLAYING);
 144 }
 145
 146 /**
 147  * get the name of the given audio format
 148  *
 149  * \param i the audio format number
 150  *
 151  * This returns a pointer to statically allocated memory so it
 152  * must not be freed by the caller.
 153  */
 154 const char *audio_format_name(int i)
 155 {
 156         return i >= 0?  afl[i].name : "(none)";
 157 }
 158
 159 /**
 160  * initialize the virtual streaming system
 161  *
 162  * Call the init functions of all supported audio format handlers and
 163  * initialize all supported senders.
 164  */
 165 void vss_init(void)
 166 {
 167         int i;
 168         char *hn = para_hostname(), *home = para_homedir();
 169         long unsigned announce_time = conf.announce_time_arg > 0?
 170                         conf.announce_time_arg : 300,
 171                 autoplay_delay = conf.autoplay_delay_arg > 0?
 172                         conf.autoplay_delay_arg : 0;
 173
 174         PARA_DEBUG_LOG("supported audio formats: %s\n",
 175                 SUPPORTED_AUDIO_FORMATS);
 176         FOR_EACH_AUDIO_FORMAT(i) {
 177                 PARA_NOTICE_LOG("initializing %s handler\n",
 178                         afl[i].name);
 179                 afl[i].init(&afl[i]);
 180         }
 181         ms2tv(announce_time, &announce_tv);
 182         PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
 183         for (i = 0; senders[i].name; i++) {
 184                 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
 185                 senders[i].init(&senders[i]);
 186         }
 187         free(hn);
 188         free(home);
 189         if (conf.autoplay_given) {
 190                 struct timeval now, tmp;
 191                 mmd->vss_status_flags |= VSS_PLAYING;
 192                 mmd->new_vss_status_flags |= VSS_PLAYING;
 193                 gettimeofday(&now, NULL);
 194                 ms2tv(autoplay_delay, &tmp);
 195                 tv_add(&now, &tmp, &autoplay_barrier);
 196         }
 197 }
 198
 199 static int get_file_info(int i)
 200 {
 201         return  afl[i].get_file_info(map, mmd->size, &mmd->afi);
 202 }
 203
 204 /**
 205  * guess the audio format judging from filename
 206  *
 207  * \param name the filename
 208  *
 209  * \return This function returns -1 if it has no idea what kind of audio
 210  * file this might be. Otherwise the (non-negative) number of the audio format
 211  * is returned.
 212  */
 213 int guess_audio_format(const char *name)
 214 {
 215         int i,j, len = strlen(name);
 216
 217         FOR_EACH_AUDIO_FORMAT(i) {
 218                 for (j = 0; afl[i].suffixes[j]; j++) {
 219                         const char *p = afl[i].suffixes[j];
 220                         int plen = strlen(p);
 221                         if (len < plen + 1)
 222                                 continue;
 223                         if (name[len - plen - 1] != '.')
 224                                 continue;
 225                         if (strcasecmp(name + len - plen, p))
 226                                 continue;
 227 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 228                         return i;
 229                 }
 230         }
 231         return -1;
 232 }
 233
 234 static int get_audio_format(int omit)
 235 {
 236         int i;
 237
 238         FOR_EACH_AUDIO_FORMAT(i) {
 239                 if (i == omit)
 240                         continue;
 241                 if (get_file_info(i) > 0)
 242                         return i;
 243         }
 244         return -E_AUDIO_FORMAT;
 245 }
 246
 247 /**
 248  * Call get_file_info() to obtain an afhi structure.
 249  *
 250  * \param path The full path of the audio file.
 251  * \param data Pointer to the contents of the (mapped) file.
 252  * \param size The file size in bytes.
 253  * \param afhi Result pointer.
 254  *
 255  * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
 256  * compiled in audio format handler is able to handler the file.
 257  *
 258  * This function tries to find an audio format handler that can interpret the
 259  * file given by \a data and \a size.
 260  *
 261  * It first tries to determine the audio format from the filename given by \a
 262  * path. If this doesn't work, all other audio format handlers are tried until
 263  * one is found that can handle the file.
 264  */
 265 int compute_afhi(const char *path, char *data, size_t size,
 266                 struct audio_format_info *afhi)
 267 {
 268         int ret, i, format = guess_audio_format(path);
 269
 270         if (format >= 0) {
 271                 ret = afl[format].get_file_info(data, size, afhi);
 272                 if (ret >= 0)
 273                         return format;
 274         }
 275         FOR_EACH_AUDIO_FORMAT(i) {
 276                 if (i == format) /* we already tried this one to no avail */
 277                         continue;
 278                 ret = afl[i].get_file_info(data, size, afhi);
 279                 if (ret >= 0)
 280                         return i;
 281         }
 282         return -E_AUDIO_FORMAT;
 283 }
 284
 285 /*
 286  * upddate shared mem
 287  */
 288 static int update_mmd(void)
 289 {
 290         int i;
 291
 292         i = guess_audio_format(mmd->filename);
 293         if (i < 0 || get_file_info(i) < 0)
 294                 i = get_audio_format(i);
 295         if (i < 0)
 296                 return i;
 297         mmd->audio_format = i;
 298         mmd->chunks_sent = 0;
 299         mmd->current_chunk = 0;
 300         mmd->offset = 0;
 301         mmd->events++;
 302         return 1;
 303 }
 304
 305 static void vss_get_audio_file(void)
 306 {
 307         char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
 308         int i;
 309         struct stat file_status;
 310
 311         if (!sl)
 312                 goto err_out;
 313         for (i = 0; sl[i]; i++) {
 314                 struct timeval now;
 315                 PARA_INFO_LOG("trying %s\n", sl[i]);
 316                 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
 317                         continue;
 318                 audio_file = open(sl[i], O_RDONLY);
 319                 if (audio_file < 0)
 320                         continue;
 321                 if (fstat(audio_file, &file_status) == -1 ||
 322                                 !file_status.st_size) {
 323                         close(audio_file);
 324                         continue;
 325                 }
 326                 mmd->size = file_status.st_size;
 327                 mmd->mtime = file_status.st_mtime;
 328                 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
 329                         audio_file, 0);
 330                 strcpy(mmd->filename, sl[i]);
 331                 mmd->afi.header_len = 0; /* default: no header */
 332                 if (update_mmd() < 0) { /* invalid file */
 333                         close(audio_file);
 334                         munmap(map, mmd->size);
 335                         map = NULL;
 336                         continue;
 337                 }
 338                 mmd->num_played++;
 339                 if (selectors[mmd->selector_num].update_audio_file)
 340                         selectors[mmd->selector_num].update_audio_file(sl[i]);
 341                 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
 342                 mmd->new_vss_status_flags &= (~VSS_NEXT);
 343                 gettimeofday(&now, NULL);
 344                 tv_add(&now, &announce_tv, &data_send_barrier);
 345                 goto free;
 346         }
 347 err_out:
 348         PARA_ERROR_LOG("%s", "no valid files found\n");
 349         mmd->new_vss_status_flags = VSS_NEXT;
 350 free:
 351         if (sl) {
 352                 for (i = 0; sl[i]; i++)
 353                         free(sl[i]);
 354                 free(sl);
 355         }
 356 }
 357
 358 static int chk_barrier(const char *bname, const struct timeval *now,
 359                 const struct timeval *barrier, struct timeval *diff,
 360                 int print_log)
 361 {
 362         long ms;
 363
 364         if (tv_diff(now, barrier, diff) > 0)
 365                 return 1;
 366         ms = tv2ms(diff);
 367         if (print_log && ms)
 368                 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
 369         return -1;
 370 }
 371
 372 static void vss_next_chunk_time(struct timeval *due)
 373 {
 374         struct timeval tmp;
 375
 376         tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
 377         tv_add(&tmp, &mmd->stream_start, due);
 378 }
 379
 380 /*
 381  * != NULL: timeout for next chunk
 382  * NULL: nothing to do
 383  */
 384 static struct timeval *vss_compute_timeout(void)
 385 {
 386         static struct timeval the_timeout;
 387         struct timeval now, next_chunk;
 388
 389         if (vss_next() && mmd->audio_format >= 0) {
 390                 /* only sleep a bit, nec*/
 391                 the_timeout.tv_sec = 0;
 392                 the_timeout.tv_usec = 100;
 393                 return &the_timeout;
 394         }
 395         gettimeofday(&now, NULL);
 396         if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
 397                         &the_timeout, 1) < 0)
 398                 return &the_timeout;
 399         if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
 400                 return &the_timeout;
 401         if (chk_barrier("data send", &now, &data_send_barrier,
 402                         &the_timeout, 1) < 0)
 403                 return &the_timeout;
 404         if (mmd->audio_format < 0 || !vss_playing() || !map)
 405                 return NULL;
 406         vss_next_chunk_time(&next_chunk);
 407         if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
 408                         &the_timeout, 0) < 0)
 409                 return &the_timeout;
 410         /* chunk is due or bof */
 411         the_timeout.tv_sec = 0;
 412         the_timeout.tv_usec = 0;
 413         return &the_timeout;
 414 }
 415
 416 static void vss_eof(void)
 417 {
 418         struct timeval now;
 419         int i;
 420         char *tmp;
 421
 422         if (!map) {
 423                 for (i = 0; senders[i].name; i++)
 424                         senders[i].shutdown_clients();
 425                 return;
 426         }
 427         gettimeofday(&now, NULL);
 428         tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 429         munmap(map, mmd->size);
 430         map = NULL;
 431         close(audio_file);
 432         mmd->audio_format = -1;
 433         mmd->chunks_sent = 0;
 434         mmd->offset = 0;
 435         mmd->afi.seconds_total = 0;
 436         free(mmd->afi.chunk_table);
 437         mmd->afi.chunk_table = NULL;
 438         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
 439                 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
 440         strcpy(mmd->afi.info_string, tmp);
 441         free(tmp);
 442         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
 443                 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
 444         strcpy(mmd->selector_info, tmp);
 445         free(tmp);
 446         mmd->filename[0] = '\0';
 447         mmd->size = 0;
 448         mmd->events++;
 449 }
 450
 451 /**
 452  * Get the header of the current audio file.
 453  *
 454  * \param header_len the length of the header is stored here
 455  *
 456  * \return a pointer to a buffer containing the header, or NULL, if no audio
 457  * file is selected or if the current audio format does not need special header
 458  * treamtment.
 459  *
 460  */
 461 char *vss_get_header(size_t *header_len)
 462 {
 463         if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
 464                 return NULL;
 465         *header_len = mmd->afi.header_len;
 466         return map + mmd->afi.header_offset;
 467 }
 468
 469 /**
 470  * get the list of all supported audio formats
 471  *
 472  * \return a space separated list of all supported audio formats
 473  * It is not allocated at runtime, i.e. there is no need to free
 474  * the returned string in the caller.
 475  */
 476 const char *supported_audio_formats(void)
 477 {
 478         return SUPPORTED_AUDIO_FORMATS;
 479 }
 480
 481 /**
 482  * get the chunk time of the current audio file
 483  *
 484  * \return a pointer to a struct containing the chunk time, or NULL,
 485  * if currently no audio file is selected.
 486  */
 487 struct timeval *vss_chunk_time(void)
 488 {
 489         if (mmd->audio_format < 0)
 490                 return NULL;
 491         return &mmd->afi.chunk_tv;
 492 }
 493
 494 /**
 495  * compute the timeout for para_server's main select-loop
 496  *
 497  * This function gets called from para_server to determine the timeout value
 498  * for its main select loop.
 499  *
 500  * Before the timeout is computed, the current vss status flags are evaluated
 501  * and acted upon by calling appropriate functions from the lower layers.
 502  * Possible actions include
 503  *
 504  *      - request a new file list from the current audio file selector
 505  *      - shutdown of all senders (stop/pause command)
 506  *      - reposition the stream (ff/jmp command)
 507  *
 508  * \return A pointer to a struct timeval containing the timeout for the next
 509  * chunk of data to be sent, or NULL if we're not sending right now.
 510  */
 511 struct timeval *vss_preselect(void)
 512 {
 513         struct audio_format_handler *af = NULL;
 514         int i, format;
 515         struct timeval *ret;
 516 again:
 517         format = mmd->audio_format;
 518         if (format >= 0)
 519                 af = afl + format;
 520         else
 521                 for (i = 0; senders[i].name; i++)
 522                         senders[i].shutdown_clients();
 523         if (vss_next() && af) {
 524                 vss_eof();
 525                 return vss_compute_timeout();
 526         }
 527         if (vss_paused() || vss_repos()) {
 528                 for (i = 0; senders[i].name; i++)
 529                         senders[i].shutdown_clients();
 530                 if (af) {
 531                         struct timeval now;
 532                         gettimeofday(&now, NULL);
 533                         if (!vss_paused() || mmd->chunks_sent)
 534                                 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 535                         if (vss_repos())
 536                                 tv_add(&now, &announce_tv, &data_send_barrier);
 537                         if (mmd->new_vss_status_flags & VSS_NOMORE)
 538                                 mmd->new_vss_status_flags = VSS_NEXT;
 539                 }
 540                 mmd->chunks_sent = 0;
 541         }
 542         if (vss_repos()) {
 543                 mmd->new_vss_status_flags &= ~(VSS_REPOS);
 544                 mmd->current_chunk = mmd->repos_request;
 545         }
 546         ret = vss_compute_timeout();
 547         if (!ret && !map && vss_playing() &&
 548                         !(mmd->new_vss_status_flags & VSS_NOMORE)) {
 549                 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
 550                 vss_get_audio_file();
 551                 goto again;
 552         }
 553         return ret;
 554 }
 555
 556 static void get_chunk(long unsigned chunk_num, char **buf, size_t *len)
 557 {
 558         size_t pos = mmd->afi.chunk_table[chunk_num];
 559         *buf = map + pos;
 560         *len = mmd->afi.chunk_table[chunk_num + 1] - pos;
 561 }
 562
 563 /**
 564  * Get the data of the given chunk.
 565  *
 566  * \param chunk_num The number of the desired chunk.
 567  * \param buf Chunk data.
 568  * \param len Chunk length in bytes.
 569  *
 570  * \return Positive on success, negative on errors.
 571  */
 572 int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
 573 {
 574         if (mmd->audio_format < 0 || !map || !vss_playing())
 575                 return -E_CHUNK;
 576         if (chunk_num >= mmd->afi.chunks_total)
 577                 return -E_CHUNK;
 578         get_chunk(chunk_num, buf, len);
 579         return 1;
 580 }
 581
 582 /**
 583  * main sending function
 584  *
 585  * This function gets called from para_server as soon as the next chunk of
 586  * data should be pushed out. It first calls the read_chunk() function of
 587  * the current audio format handler to obtain a pointer to the data to be
 588  * sent out as well as its length. This information is then passed to each
 589  * supported sender's send() function which does the actual sending.
 590  */
 591 void vss_send_chunk(void)
 592 {
 593         int i;
 594         struct audio_format_handler *af;
 595         struct timeval now, due;
 596
 597         if (mmd->audio_format < 0 || !map || !vss_playing())
 598                 return;
 599         af = &afl[mmd->audio_format];
 600         gettimeofday(&now, NULL);
 601         vss_next_chunk_time(&due);
 602         if (tv_diff(&due, &now, NULL) > 0)
 603                 return;
 604         if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
 605                 return;
 606         if (chk_barrier("data send", &now, &data_send_barrier,
 607                         &due, 1) < 0)
 608                 return;
 609         mmd->new_vss_status_flags &= ~VSS_REPOS;
 610         if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
 611                 mmd->new_vss_status_flags |= VSS_NEXT;
 612                 return vss_eof();
 613         }
 614         /*
 615          * We call the send function also in case of empty chunks as they
 616          * might have still some data queued which can be sent in this case.
 617          */
 618         if (!mmd->chunks_sent) {
 619                 struct timeval tmp;
 620                 gettimeofday(&mmd->stream_start, NULL);
 621                 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
 622                 mmd->offset = tv2ms(&tmp);
 623                 mmd->events++;
 624         }
 625         for (i = 0; senders[i].name; i++) {
 626                 char *buf;
 627                 size_t len;
 628                 get_chunk(mmd->current_chunk, &buf, &len);
 629                 senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
 630         }
 631         mmd->new_vss_status_flags |= VSS_PLAYING;
 632         mmd->chunks_sent++;
 633         mmd->current_chunk++;
 634 }